bt455.h

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/*
 *  linux/drivers/video/bt455.h
 *
 *  Copyright 2003  Thiemo Seufer <[email protected]>
 *
 *  This file is subject to the terms and conditions of the GNU General
 *  Public License. See the file COPYING in the main directory of this
 *  archive for more details.
 */
#include <linux/types.h>

/*
 * Bt455 byte-wide registers, 32-bit aligned.
 */
struct bt455_regs {
    volatile u8 addr_cmap;
    u8 pad0[3];
    volatile u8 addr_cmap_data;
    u8 pad1[3];
    volatile u8 addr_clr;
    u8 pad2[3];
    volatile u8 addr_ovly;
    u8 pad3[3];
};

static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
{
    mb();
    regs->addr_cmap = ir & 0x0f;
}

/*
 * Read/write to a Bt455 color map register.
 */
static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr,
                     u8* red, u8* green, u8* blue)
{
    bt455_select_reg(regs, cr);
    mb();
    *red = regs->addr_cmap_data & 0x0f;
    rmb();
    *green = regs->addr_cmap_data & 0x0f;
    rmb();
    *blue = regs->addr_cmap_data & 0x0f;
}

static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr,
                      u8 red, u8 green, u8 blue)
{
    bt455_select_reg(regs, cr);
    wmb();
    regs->addr_cmap_data = red & 0x0f;
    wmb();
    regs->addr_cmap_data = green & 0x0f;
    wmb();
    regs->addr_cmap_data = blue & 0x0f;
}

static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr,
                      u8 red, u8 green, u8 blue)
{
    bt455_select_reg(regs, cr);
    wmb();
    regs->addr_ovly = red & 0x0f;
    wmb();
    regs->addr_ovly = green & 0x0f;
    wmb();
    regs->addr_ovly = blue & 0x0f;
}

static inline void bt455_set_cursor(struct bt455_regs *regs)
{
    mb();
    regs->addr_ovly = 0x0f;
    wmb();
    regs->addr_ovly = 0x0f;
    wmb();
    regs->addr_ovly = 0x0f;
}

static inline void bt455_erase_cursor(struct bt455_regs *regs)
{
    /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */
    /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */
    bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03);
    bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07);

    wmb();
    regs->addr_ovly = 0x09;
    wmb();
    regs->addr_ovly = 0x09;
    wmb();
    regs->addr_ovly = 0x09;
}